<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
         div {
             width: 500px !important; 
             height: 500px !important; 
             transition: all 1s ease ;
             min-height: 1500px;
         }
    </style>
</head>
<body>
  
        <div id="app">
             <div v-bind:style="{color:activeColor,background:activeColor2}">
                box
             </div>
        </div>
 
   
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
     
        var vm = new Vue({
            // 监管的容器 
            el:'#app',
            // 数据定义
            data:{
                activeColor:'green',
                activeColor2:'red' 
            }
        })

        setTimeout(()=>{
            vm._data.activeColor2='blue'
            vm._data.activeColor = 'black'
        },3000)
      

      

    </script>
</body>

</html>